**Differentiated Learning Objectives**

- All students should be able to calculate an unknown length in a non right-angled triangle using the Cosine rule.
- Most students should be able to calculate a magnitude of direction using bearings and a length in a non right-angled triangle using the Cosine rule.
- Some students should be able to derive and apply the Cosine Rule to calculate unknown lengths in triangle shapes.

**Free Downloads and Links**

Proof of the Cosine Rule**Related Blogs**

Solving Problems with Non-Right-Angled Triangles

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